import React, { Component } from 'react'
import PropTypes from 'prop-types'

class Comment extends Component {
  static propTypes = {
    comment: PropTypes.object.isRequired,
    index: PropTypes.number.isRequired,
    onDeleteComment: PropTypes.func.isRequired
  }
  constructor () {
    super()
    this.state = {
      timeString: ''
    }
  }
  componentWillMount () {
    this._updateTimeString()
    this._timer = setInterval(this._updateTimeString.bind(this), 5000)
  }
  componentWillUnmount () {
    clearInterval(this._timer)
    this._timer = null
  }
  _updateTimeString () {
    const { comment } = this.props
    const duration = (+Date.now() - comment.createdTime) / 1000
    this.setState({
      timeString: duration > 60 ? `${Math.round(duration / 60)} 分钟前` : `${Math.round(Math.max(duration, 1))}秒前`
    })
  }
  _getProcessedContent (content) {
    return content
      .replace(/&/g, "&amp;")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;")
      .replace(/'/g, "&#039;")
      .replace(/`([\S\s]+?)`/g, '<code>$1</code>')
  }
  handleDeleteComment () {
    this.props.onDeleteComment && this.props.onDeleteComment(this.props.index)
  }
  render () {
    return (
      <div className='comment'>
        <div className='comment-user'>
          <span>{this.props.comment.username} </span>：
        </div>
        <p dangerouslySetInnerHTML={{
          __html: this._getProcessedContent(this.props.comment.content)
        }}>
        </p>
        <span className='comment-createdtime'>
          {this.state.timeString}
        </span>
        <span className='comment-delete' onClick={ this.handleDeleteComment.bind(this) }>
          删除
        </span>
      </div>
    )
  }
}

export default Comment